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vlada-n [284]
2 years ago
6

Helen purchased 3 copies of a book online at a 20% discount. She also paid $10 for shipping that was not discounted. How much wa

s the original price of one copy of the book if her total ended up being $40?
Mathematics
1 answer:
umka21 [38]2 years ago
3 0

Answer:

The original price of the book was $12.50

Step-by-step explanation:

3x - 0.2(3x) + 10 = 40
30x - 2(3x) + 100 = 400
   30x - 6x + 100 = 400
           24x + 100 = 400
                     24x = 300
                         x = 12.50

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La ecuación de la linea es: y = -4x + 2600

<h3>¿Como determinar la relación lineal?</h3>

Tenemos dos puntos para nuestra linea, los cuales son (350, 1200) y (320, 1320).

Con esos dos puntos podemos obtener la pendiente de la linea:

a = \frac{1320 - 1200}{\ 320 - \ 350}  = -4

Entonces la linea es algo como:

y = (-4)*x + b

Para obtener el valor de b usamos uno de los dos puntos dados, como el primero:

1200 = (-4)*350 + b

1200 = -1400 + b

1200 + 1400 = b = 2600

Entonces la linea es:

y = -4x + 2600

Si se vendieron 35 unidades, podemos reemplazar:

35 = -4*x + 2600

4x = 2600 - 35 = 2565

x = 2565/4 = 641.25

Es decir, el precio es $641.25

Sí quieres aprender más sobre lineas:

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Answer:

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Since the inch to cm conversion doesn't add any uncertainty, so we are free to keep any and all the significant figures.

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